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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a236e30f3cdd0385a0eda359abcba7f3802c7714f745d015d4fe37a17ecf9f' 
  AND token = 'r+hQbjHktBT6sI7VeJF0CZyN52kHG5eGiD2MORv9i5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}